<template>
  <div>
    <h1>我是父元素</h1>
    我是数子：{{ num }}---{{ num2 }}
    <!-- <Son :value="num" @input="value=>num=value" /> -->
    <!-- <Son
      :aa="num"
      :bb="num2"
      @update:aa="val=>num=val"
      @update:bb="val=>num2=val"
    /> -->
    <son :aa.sync="num" :bb.sync="num2" />
  </div>
</template>
<script>
import Son from './Son.vue'
export default {
  components: {
    Son

  },
  data() {
    return {
      num: 100,
      num2: 200
    }
  }
}
</script>
